UVa 11384 Help is needed for Dexter (构造解并证明)
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来源:《算法竞赛入门经典训练指南》第1章例题10、UVa-11384
题目描述:
对于序列
题目分析:
如果只要AC,什么都不用说直接蒙
这里给出严谨的证明。 对于数值上相同的数,视作同一个,或者说只记一次。首先对于
- - - - 更新:嘛我发现好像可以证得更简略一点,对于下面提到的
于是有
猛然发现好像构造方法没说,这个其他题解随便搜一下吧。简单地说,从中间二分,再注意红色字体说的,也很好猜。
// Created by wander on 16/06/21.// Copyright © 2016年 W4anD0eR96. All rights reserved.// From: UVa-11384// Sort: 贪心算法-构造#include "bits/stdc++.h"using namespace std;int n;int main() {#ifdef DEBUG freopen("in", "r", stdin); freopen("out", "w", stdout);#endif while (~scanf("%d", &n)) printf("%d\n", (int)log2(n) + 1); return 0;}
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